Datums - ashtech ZY-12 Information Supplement

Datums

This appendix presents transformation parameters that are used by GPS
receivers to convert pseudo-range positions, shown on Screen 2, from WGS-84
into the desired datum. The datums are from Deptartment of Defense document
SS-M/V-500, Rev. P, 16 Oct. 1991. Receiver datum codes are selected from a
subscreen of Screen 4 on the receiver DATUM SELECT option.
• Geoid heights computed using spherical harmonic expansion and WGS-
84 EGM.
• WGS-84 minus local geodetic systems. All values in meters.
Reciver
Local Geodetic
Datum
System
Codes
ARF-M ARC 1950
ARS-M ARC 1960
AUA Austr. Geod.
1966
AUG Austr. Geod.
1984
Datums
Table A.1. Datum Translation Parameters
eference
R
Area
Ellipsoid
Botswana, Clarke 1880
Lesotho,
Malawi,
Swaziland,
Zaire,
Zambia,
Zimbawe
Kenya, Clarke 1880
Tanzania
Australia, Aust. Nat'l.
Tasmania
Island
Australia, Aust. Nat'l.
Tasmania
Island
Parameter Differences
a (m) f ×10
-112.145 -0.54750714
-112.145 -0.54750714
-23 -0.00081204
-23 -0.00081204
A
Transformatio
Parameters
4
X(M) Y(M) Z(M)
-143 -90 -294
-160 -8 -300
-133 -48 148
-134 -48 149
105